Rock-drill making and sharpening machine.



Patented July 6, 1909. 4 SHEETS-SHBBT 1.

ATTORNEYS ramZi l J1 G. W. SMITH. ROCK DRILL MAKING AND SHARPBNINGMACHINE.

APPLICATION FILED JUNE 17, 1905.

WITNESSES.

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G W. SMITH. ROCK DRILL MAKING AND SHARPENING MACHINE. I

APPLIOATION FILED JUNE 17, 1905.

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APPLICATION FILED JUNE 17, 1905.

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G. W. SMITH.

ROCK DRILL MAKING AND SHABPBNING MACHINE.

APPLICATION FILED JUNE 17, 1905.

927, 1 81,. Patented July 6, 1909.

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GRANT W. SMITH, OF OTTUMWA, IOWA.

ROCK-DRILL MAKING AND SHARPENING MACHINE.

Specification of Letters Patent.

Application filed June 17, 1905.

Patented July 6, 1909.

Serial No. 265,777.

To all whom it may concern:

lie it kimwn that l, GRANT V1 SMITH, residing at (lttumwa, in the countyof VVzLIWllO and State of lowa, have invented a new and. ImprovedHock-Drill Making and. Sharpening Machine, of which the following is aspeci lication.

The object 01. my present invention is to provide a new and improvedmeans for accurately fashioning andsharpening rock drills and otherdrills, cl :1. simple, compact and durable construction, in which thedrill mai ing and sharpening mechanism is especially adapted to beactuated under pneumatic power and in. which. the several parts aredesigned. to be easily manipulated, quick in action and elliective forthe intended purposes.

Generically, my invention comprehends a suitable support or bed castingon which is mounted die holders, automatically movable within theirseats or supports, in such manner, whereby to separate or open up in onedirection of their movement to permit of a quick and accurate insertionof the drill or bit stock, and to close together when the dolly is putinto operation, whereby to pinch the drill stock in such manner, thatthe harder the dolly hits the drill, the tighter the dies pinch it tofirmly secure it to the desired position.

My invention also comprehends an improved correlation of parts,particularly designed. for effecting a rapid fashioning and sharpeningof the bit or drill stock and in such manner that the drills come out ofthe machine finished red hot and about the right heat to receive thetemper.

111 its more subordinate features, my inven tion consists in certaindetails of construction and peculiar combination of )arts, all of whichwill be hereinafter 'lul y described, pointed out in the appendedclaims, and illustrated in the accompanying drawings, in which Figure 1,is a perspective View which illustrates the general arrangement of myinven tion. Fig. 2, is a top plan view thereof, the parts being adjustedto hold the die carriers and dies separated to permit of the insertionof the bit or drill stock. Fig. 3, is a similar view showing the diecarriers and dies positioned. to pinch the drill, the dolly being at itsrearmost position in full lines and to its ham- Inering or die engagingposition in dotted lines. Fig. l, is a longitudinal section taken on theline r e of Fig. 3, the dolly being shown to its foremost or hammeringposition. F ig. 5, is an inverted plan vicwof a portion of the partsshown in Fig. 4., the dolly actuating means being at their rearmostposition. F 6, is a perspective view of the dolly. Fig. 7, is a detailhorizontal section taken substantially on the line 7- 7 of Fig. 4:. Fig.8, is a longitudinal. section of one of the adjustable crank linkmembers on the line 88 of F 3. Fig. 9, is a transverse section taken onthe line 9-9 of Fig. 4. Fig. 10, is a cross section. on the line 10-10on Fig. 3, looking in the direction of the arrow. Fig. 11, is a similarview on the line 1111 of Fig. Fig. 12, is a cross section on the line13-43 on Fig. 3. Fig. 1.3, is a transverse section on the line 14-44 ofFig. 2. Fig. 14, is a detail view of the two die holders. Fig. 15, is asimilar view of the two die members.

In the practical. assembling of the parts, that constitute my completemachine, they are suitably mounted upon a pair of strong bed timbers orbeams, (t ct, supported on piers 71-4) to bring the mechanism to theproper height for convenient manipulation thereof. In all its details,the mechanism comprises a main casting or base 9 which extendslengthwise of and is bolted. to the timbers ac and its inner or head end9 is widened to accommodate the die holding devices presently referredto.

At the outer end and on the top of the casting 9, is horizontallydisposed an air cyl inder 10 which is utilized for actuating the dollyand in it operates the piston 10 whose rod extends through the gland 10and terminates in a forked head 10 to receive the flattened shank 12 ofthe dolly carrier 1.2 mounted to reciprocate in a bearing 9 projected upfrom the casting 9, on which bearing the carrier is slidably held by thebox or cap piece 13 bolted on the hearing as shown and the said carrieris arranged to be reciprocated under air pressure, fed into the oppositeends of the cylinder 10 in the manner hereinafter explained.

The inner end of the carrier 12 has a socket 1.2 to detachably receivethe dolly 5 shown in detail in Fig. 6 which is secured to the carrier bythe cross pin 5 as clearly shown in the drawing, the said connectionbeing provided to permit of readily changing the dolly by removing pin5.

l l ld designate a pair of crank shafts that extend down throughvertical bearings in the base casting 9 disposed in transversealinement, one to each side of the dolly head and held. to theirbearings by the detachable boxes 1.4L 14 as best shown in Figs. 2 and 3.The shafts 1 1 1 1 are provided for imparting a reciprocating motion tothe die holders or carriers 7 7 of soft steel and which are held toslide in the wedge shaped opening 9 formed in a housing section 9 anintegral part of the base 9 and projected upwardly in alinement with thedolly and its actuating devices.

The carriers 7 are constructed alike and mounted so their opposing facesform a central opening X to receive the drill bit or stock, indicated byY, and said carriers 77 are tapered to fit the wedge shaped opening inthe housing 9 and have their opposing faces parallel with each other andwith the longitudinal axis of the machine, so that, when they are pushedinwardly, through the action of the crank shafts their opposing facesclose together toward the drill or stock piece Y, it being understood,that when the said members 77 are pulled forward they separate and giveample room for the insertion of the drill or stock Y, and to furtherpermit of freely placing the bit or stock pieceY in position, theopposing straight faces of said members 77 have notches 7 to allow forthe tongs by which the stock Y is placed in position.

8-8 designate the die blocks that are held in sockets 7 7 c in the outerends of the carriers 7 7 and in which they are firmly held by the straps21 whose ends are so formed that they can be easily slipped into aninterlocked engagement with the headed studs or bolts 21-21'", see Figs.2 and 3.

In practice the carriers 7-7 are reciprocated about four inches and thewedge of the opening in the housing 9, is such, that when the dolly isput into operation and hits the drill, the dies firmly pinch the drilland the harder the dolly hits the drill, the more the dies pinch, andthe wedge shape of the die opening and the corresponding shape of thecoincident part of the dies, serve to crowd the dies and the carrierinwardly at each stroke of the dolly.

Each shaft 1414 has a horizontal crank member l4"14 at the upper endwhich pivotally connect with the ends 18 of the ink connections, eachconsisting of the members 18-1E and the adjustable union nut 19 thatengages the adjacent threaded ends of the members 18 and 18 202Odesignate check nuts that also engage the threaded ends of the members1S -18 The members IS -18 are connected to the members 77 by the pins 21The lower ends of the shafts 1 114 carry forwardly projected crank arms14 the free ends of which are fulcrumed on a cross head 17 which slidesin a longitudinal groove 9 in the bottom of the casting 9 and the saidhead is held to the groove by the flange plates 17] 7, as clearly shownin Figs. 4 and 5.

The cross head is actuated by a piston 15 that works in the cylinderbolted upon the lower side of the casting 9 at that end on which thecylinder 10 is mounted.

It will be noticed by reference to 5, the cross head connection with thecrank shafts let-14 is such, that as the said cross head comes to theposition shown. in Fig. 5 it gives great strength in shutting the diesand holding them firmly shut, and the union nuts 19 on the topconnections can be readily ad justed so the position of the inner endsof the links 16, when as shown, will be practically on a central lineand ill thereby produce great power in holding the dies shut. it willalso be noticed by reference to Fig. 5, that the rounded ends of thecranks or link members 1616 are so fulcrumed that they roll against eachother, to relieve the fulcrum pins ]6"16 of unnecessary strain.

The piston 15 is actuated at predetermined times to move the diecarriers to their inner or outer adjustments by a valved controlled airsupply to each end of the cylinder 15 which will hereinafter be againreferred to.

To properly guide the carriers or holders during movement, the upperside of said carriers 7 7 have longitudinal grooves 7 -7 that extend thefull length of the carriers as best shown in Fig. 1 1 and which receivethe pendent flanges 2 1 2 t formed upon the under side of the cap plates2 l24 bolted on the housing casting 9 and which lap over the openingtherein as shown.

26 designates a rectangular frame that is bolted to and extendsreaiwardly from the casting 9 and which is provided with paral lelhorizontal guideways, see Fig. 13, upon which is slidably held the castmetal frame or carriage 27 also of rectangular shape and which has atits opposite ends pendent portions 27 as best shown in Fig. 1.

Upon the frame 27 is slidably mounted a third air cylinder 31 which isutilized for effecting a hold back action, since it acts to hold thedrills or bit stock members being shaped and sharpened from slippingthrough the dies, and forms, as it were, the cushion or abutment to takeup the impact shock against the end of the drill head imparted by thedolly. The sliding frame 27 is connected to the die holders or carriers77 by a pair of link rods or arms 2828, the connection of said arms withthe frame and carriers 7 7 being such, that when pneumatic or otherforce is applied to reciprocate the members 7 7 the for reasonspresently explained and for such purpose the said cylinder 31 haslateral flanges 13 -13" that ride upon guide ways 27 -27 formed in theframe 27 as best shown in Fig. 13. It should. be stated, however, thatthe cylinder casing 31, when. properly adjusted upon the frame 27, isfixedly held on the said frame to move with it and to provide foreffecting the slidable adjustment of the cylinder 31 on the frame 27, along feed. screw 30 is mounted under the cylinder 31 which has its endssupported in the pendent members 27 -27 on the frame 27 and whichengages the pendent threaded portion of the cylinder 31. At its forwardend the screw 30 carries the bevel pinion 30 which meshes with a pinion30 on a short crank shaft 30 journaled in the frame 27 (see Fig. 12) tomove therewith. The purpose of adjusting the cylinder 31 on the frame 27is to provide for setting the said cylinder 31 on the frame toaccommodate different lengths of drills. The frame 27 is held to slideon the supporting frame26bycap plates 26 26 see Fig. 13.

designates a soft steel bar that takes through the guide aperture 1O inthe body of the cylinder 31 at a point between the air chamber and itsscrew aperture, see Fig. 13 and to maintain the said bar in its properposition it has a vertical rib 33 that engages with the groove 33 a inthe said cylinder body.

It will be observed by now referring to Fig. 4 that the bar 33 extendsinwardly to a point near the dies 8 and it has its rear end connected tothe frame 26. This bar is firmly held and forms a central guide for theframe 27 and at the inner end it has a vertical eX- tension which formsguide rest for the forward end of the piston rod 31, and the latter hasa socket 35, the outer end of which is slotted at the top (see Figs. 2,3 and 4) to permit of drop 'iingthe rear end of the drill therein, andslipping it back. within the socket formed in the end of the piston rod31 to provide for a quick connection of the drill with the plunger orpiston rod 31.

In the complete machine air is led to and. exhausted from the threecylinders 10, 15 and 31 by suitably arranged valved feed pipescontrolledv by lever mechanism arranged to be actuated by the operator.

For the cylinder that controls the operation of the dolly, a throttlevalve T is placed in the back of the air pipe that leads to the airchest, and the said valve is controlled by a rod 25 actuated. by a leverif.

U designates a lever that controls the feed and exhaust of the air tothe cylinder 15 that controls the opening and closing of the dieholders, and. the said lever cooperates with a three-way valve 33 ateach end of the said cylinder which are coupled by a rod w with whichthe lever U connects whereby a shift of the lever U in one direction,opens one end of the cylinder 15 to atmosphere while air is being fedinto the other end.

V designates a third lever that controls the air feed to the hold oncylinder, the same operates a three way valve 4 located right at thelever and from which runs a one-half inch air hose 4: that connects withthe end of the cylinder 31.. By moving the lever V back in the directionindicated by the arrow on Fig. 3, the air will be let out of thecylinder 31 so its piston can be moved. back by hand. any time theoperator so desires.

The manner in which my machine operates, briefly stated, is as follows:-The drill or stock piece is dropped in the slot or opening between thecarriers 7-7 and the dies 88 and the piston in cylinder 31 is pushedback until the drill stock extends enough beyond the dies to upset andfill the dies. The drill is now held by the tongs up against one die,and by then adjusting the lever that controls the cylinder 15 to feedair therein, the carriers 77 and the dies 88 are moved back into thewedge shape opening in the base 9 until the dies close and pinch thedrill. The lever that controls the air to the hold on cylinder 31. isthen adjusted to feed air in thecylinder 31 to hold the piston forwardto exert a cushion pressure against the rear end of the drill, and whenthe latter adjustment has been made the operator steps on the footlever, which sets in action, the cylinder that actuates the dolly, whichis successively and in the practical application of my invention, causedto rapidly impact the drill head. As soon as the drill head has beenupset enough to fill the dies, the air is released from the hold oncylinder which then allows the drill to be driven baclf into the dies,giving as it were, a push in motion to the drill stock, and this finaloperation on the drill gives its head or bit end the desired shape anddiameter.

It will be observed that by reason of the peculiar construction andarrangement of parts shown and described, the operation of forming andsharpening the drill is effected entirely by pneumatic action and whilethree distinct air cylinders, each having an independent function, areprovided, the means for controlling the said cylinders are under directcontrol of the operator and are such that a large number of drills canbe sharpened in a very little time, in the practical use of my machine,the capacity being about one hundred and eighty per hour.

The sharpening is done so quickly as to leave the drill finished whilered hot and in a proper heat for tempering.

My construction of drill fashioning and sharpening machine is adaptedfor any shape of steel drill stock, round, hexagon, or regular drillsteel, but is more especially adapted for pound or hexagon bullets ordrill stock memers.

By using an air held hold on for backing up the drill stock, I amenabled to positively hold the drill in position to be engaged by thedolly, since the dies alone are not sufficient under a severe impact ofthe dolly to hold the drill. The pneumatic pressure on the back end ofthe drill makes it possible to obtain an accurate forming and sharpeningof the drill without the least danger of bending the drill stock whichwould occur were the hold back in the nature of a solid abutment, as thedolly has to strike so hard to put the teeth on, that the stock it heldagainst a solid abutment will upset too much and bend between the diesand holders. Again the air in the cylinder 31, makes a cushion hold backwhich can be regulated to suit and compensate for any excessivehammering on the drill head. Again, since the air cylinder 31 is longenough to allow for a variation of piston adjustment from four to fiveinches, for different sizedrdrills, this avoids actuating the crankgears for shifting the frame 27.

From the foregoing taken in connection with the accompanying drawings,the complete operation, construction and advantages of my invention itis believed will be readily apparent to those skilled in the art towhich it appertains.

Having thus described my invention, what I claim and desire to secure byLetters Patent, is

1. In a machine of the class described, the

combination with an upsetting means having converging surfaces, dies forgripping the drill stock, and slidably mounted between said surfaces,said dies adapted to hold the drill stock in position to be engaged bythe dolly and a hold-back for engaging the rear end of the drill stockwhich consists of a longitudinally movable frame and a fluid pressurecontrolled cylinder and piston arranged to be held up against the drilland means for adjusting the cylinder for different lengths of the drillstock.

2. The combination of the reciprocatingly mounted dolly or upsettingdevices, of the wedge shaped chamber, the wedge shaped die holdersmounted therein, the dies mountr ed in the holders, the air cylinder 15and piston therein, the cross head connected to the piston, the crankshafts 1414 the link arms 16, connecting the said shafts and the crosshead, and the link arm connections that join the shafts and the dieholders as set forth.

GRANT I. SMlTH.

Witnesses:

E. R. MrroHELL, J. H. MITCHELL.

